You cant think of your password because your thinking too hard. Take a break continue with your PIN.
Try sleeping on it and I bet you will remember the password.
As far as I know you need your password to get into your install.
The only difference might be when using install media to boot into the Recovery options you don't need a password. What you can do from there is limited as far as making changes to your current install but you can perform certain recovery operations.
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